21=-7(p+8)

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Solution for 21=-7(p+8) equation: 



21=-7(p+8)

We move all terms to the left:

21-(-7(p+8))=0



We calculate terms in parentheses: -(-7(p+8)), so:

-7(p+8)

We multiply parentheses

-7p-56

Back to the equation:

-(-7p-56)



We get rid of parentheses

7p+56+21=0

We add all the numbers together, and all the variables

7p+77=0

We move all terms containing p to the left, all other terms to the right

7p=-77

p=-77/7

p=-11

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